JPS63143309A - Device for mounting two camshaft to cylinder head for multicylinder series internal combustion engine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a bearing housing for each cylinder that includes a bearing housing supported by the cylinder head housing and provided in a cross section of the cylinder head that is spaced approximately the same distance from each other. Especially 4
The present invention relates to a device for attaching two camshafts to the cylinder head of a multi-cylinder serial internal combustion engine, which is equipped with two valves.

In the case of internal combustion engines that accommodate two camshafts located above, the bore form is generally kept as symmetrical as possible so that it can be approached from the top of the cylinder head. There is a problem with providing cylinder head screws in the cylinder head housing.

To achieve this, it has already been proposed in West German Patent No. 23 42 530 for an internal combustion engine with a device of the type mentioned above to provide the bearing housings of the camshafts in each cylinder lateral central plane and to connect the cylinder head screws to the housings extending between the cylinders. It has been suggested that the camshaft be provided on the inner side surface of the camshaft. However, the accessibility afforded by this means that the camshafts have a large distance from each other (which is synonymous with a large valve angle), and that no more than four cylinder head screws are required for fixing the cylinder head. The above measures are prerequisites. Therefore, known devices may be implemented with relatively small valve angles due to the need for a compact combustion chamber, and due to the high combustion chamber pressure, ideally six cylinder head screws are used. It is not suitable for use in the cylinder head of a diesel engine because the cylinder may be fixed in place.

I will do it. The basic object of the invention is therefore to ensure that the valve position and therefore the combustion chamber structure and the cylinder head torsion number and position can be selected completely independently of the camshaft mounting and the camshaft mounting. Axial mounting is to improve the device.

For divination.

This object is achieved by the features described in the characterizing part of patent claim S1.

According to the present invention, separation of the camshaft mounting device and the cylinder head is suitably achieved, and as a result, the conventionally cast camshaft mounting device can be omitted, thereby simplifying the cylinder head base. The camshaft mounting allows the camshaft bearing frame to be machined separately from the cylinder head by separating the equipment and the cylinder head, which makes it possible to machine the camshaft bearing frame separately from the cylinder head, which makes it possible to machine the camshaft bearing frame separately from the cylinder head. Its use enables rational manufacturing.

Furthermore, in the present invention, the position of the valves and the number and position of the cylinder head screws, since the camshaft mounting is independent of the device, allows the cylinder head to be adjusted to four valves per cylinder and the small valve angle and especially It has the advantage of being easy to manufacture with four or more cylinder head screws suitable for use in diesel engines.

Since there is no device for mounting the camshaft on the cylinder head, the cylinder head base can be reduced in height by approximately the assembled dimension of the bearing housing. In the case of a cylinder head with a guide housing for the cup tappet of the valve, this means that the separating surface, on which the cylinder head cover rests, for example, can be moved to approximately the upper level of the guide housing. Furthermore, another advantage of the present invention is that the entire ``camshaft mounting device'' as a unit can be replaced in the event of repair, thus making it possible to carry out adjustment operations heretofore required. It is not necessary to disassemble the cylinder head. Insofar as the bearing frame is constructed as a casting which rests on the housing wall on the side of the cylinder head by means of two vertical jambs, the oil supply of the camshaft bearing is directed to the bearing frame by grooves or holes cast in the vertical jambs. This has the advantage that the elongated holes in the cylinder head housing that are otherwise common can be omitted. The bearing frame allows the machining of the bearing housing in conventional cylinder heads.
The advantage is that perforations in the cylinder head wall on the end side are no longer necessary, which at the same time simplifies the sealing between the cylinder head and the cylinder head cover.

Finally, the camshaft mounting is such that the device and the cylinder head are preassembled independently of each other (in which case the preassembly of the camshaft mounting also includes the installation of the spur gear and the adjustment of the control times); Therefore, in the final assembly of the engine.

For camshaft mounting as a unit, it is sufficient to integrate the device into the cylinder head, which simplifies the adjustment of control times compared to conventional dual camshaft mounting devices.

Other embodiments of the invention are indicated in the dependent claims.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be explained in detail using illustrated embodiments.

The device for attaching the two camshafts (1) and (2) to the cylinder head (3) of an in-line internal combustion engine, which is not shown in detail, consists of a camshaft bearing frame (made separately from the cylinder head (3)). 6) includes several bearing housings (4a) to 4e) and (5a) to 5e). The camshaft bearing frame (6) shown in FIG. 1 for a four-cylinder internal combustion engine consists of longitudinal e (7) and (8) extending parallel to each other in the longitudinal direction of the cylinder head and connected to each other by at least two transverse frames. and,
A bearing housing (4a) to 4e) integrally formed inside the vertical frame (7) and a bearing housing (5a) to 5e) integrally formed inside the vertical frame (8). It consists of a single casting with a In that case, the bearing housings can be constructed as individual housing rings fixed to the longitudinal frames (7) and (8), or, conversely, the bearing housings facing each side of the cylinder head can be constructed simultaneously with the bearing frame. (6) It can be coupled to the pair of bearing housings forming the horizontal frame.

In the embodiment of FIG. 1, as shown in the examples of bearing housings (4e) and (5e), the bearing housings provided on the side surfaces of the cylinder heads are connected to each other, and a common bearing bottom plate and It is divided into common bearings M(8). In that case, the bearing bottom plate obtained by splitting the bearing simultaneously forms a transverse frame (lO) or 14). The bearing frame (6) extends over the entire length of the cylinder head (3), in which case the two outer transverse frames (
lO) and (14) are each supported by the cylinder head (3) immediately inside the end housing wall. The spacing between the horizontal frames (11) to 13) is adjusted to the cylinder spacing, and the cylinder head housing (3) is fixed on the cylinder head lateral surface extending between the cylinders.

In order to ensure reliable support of the bearing frame (6) in the cylinder head (3), a control chamber (15) is installed between the cylinders.
) is drawn in by a transverse wall (16), which transverse wall (10) of the bearing frame (8) extends towards the upper side of the cylinder head.
) to 14) is provided with a flat-machined support surface (17), on which the underside (18) is likewise flat-machined. The bearing frame (6) is fixed to the cylinder head (3) together with the bearing M (9) via the respective horizontal frame (10) or 14) at the horizontal wall (16) using three threaded holes h (19). ) or 21). These screw bolts (19) or 21
) are passed through the respective three through holes (22) to 24) of the horizontal frame (10) to 14) and the corresponding bearing cover (9), and the horizontal! It is screwed into the screw hole (16). To secure the bearing cover, through holes (22) and (
24) is formed in steps.

The cylinder head (3) consists of a one-piece casting which can be made from other materials as the cam I[b ih receiving frame (8). For each cylinder, the cylinder head (3) has a combustion chamber (27) and two entry valves (2
(1) and two discharge valves (2), an inlet passage (30) and a discharge passage (31) connected to these, and a cooling water chamber (15) that passes through all cylinders and is separated from the control room (15).
32). In addition, the cylinder head (
3), each cylinder has an inlet valve (28) and an outlet valve (29).
) and a preheating chamber neck hole or a spark plug hole.

Since the camshaft mounting device is separated from the cylinder head (3), the inlet valve (28) and discharge valve (29) are
They can be provided inclined at a small valve angle relative to each other.

In addition, the camshaft mounting is independent of the device, and the cylinder head screws can be provided on the cylinder head base completely freely in terms of number and position.

The entry valve (2nd) and the discharge valve (29) are controlled by cup tappets (33) and (34) fitted in guide housings (35) and (36) provided in the control room (15). via the camshafts (1) and (2). The camshaft installation is done by separating the device and the cylinder head, so that the mounting surface of the cylinder head cover (37
) can be lowered to the upper edge of the guide housings (35) and (36), in which case the supporting surface (17) and the mounting surface (37) are placed in one plane for common processing. It's dark.

In order to supply lubricating oil to the individual bearing housings (4a) or 5e), one of the vertical frames (7) or (8) has a vertical hole (38) which is connected to a communicating hole (not shown). It is connected to the oil supply hole of the cylinder spatula l' (3) through the cylinder spatula l' (3). From the vertical hole (38), the individual horizontal frames (10) or 14
), an oil channel (39) branches off and joins the bearing bottom plates (40) and (41) of the bearing housing (4a) to 5e).

As previously mentioned, the two camshafts (1) and (2) are preassembled independently of the cylinder head housing (3). In order to ensure the installation position of the two pre-assembled camshafts in the bearing frame (θ), the bearing cover is secured to the horizontal frame ( 10) to 14). In that case, in order to ensure as uniform a pressure distribution as possible on the two camshafts, the fixing of the bearing cover to the transverse frame takes place by means of a threaded bolt (20) provided in the center of the bearing housing.

For this purpose, the through holes (
23) is equipped with a threaded portion (42), and after placing the camshafts (1) and (2) into the bearing frame (6) and covering the bearing cover (9), the threaded portion (42) is fitted with a threaded portion (20). ) is screwed in. Next, the support sleeve with slits (
43) is pushed around the bolt shaft protruding upward from the three-bearing cover (9), and after the threaded bolt (20) is tightened, the bearing cover (8) is secured to the horizontal frame (8) by the support sleeve (43). 10) or 14). Control wheels are then attached to both camshafts (1) and (2) and the control times are adjusted. With such a prefabricated camshaft mounting, the device is first fixed to the cylinder head (3) by external threaded bolts (11) and (21). The support sleeve (43) is then removed;
A threaded bolt (20) is screwed into a threaded hole in the side wall (18).

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention. FIG. 2 is a sectional view showing the device according to the present invention installed in a four-valve cylinder head for a diesel engine. FIG. 3 is a sectional view showing the structure of the device according to the invention in which a camshaft is pre-installed. 3... Cylinder head housing, 4a to 4e, 5a to 5e... Bearing housing,
6...Camshaft bearing frame, 7.8...Vertical frame, 8...Bearing cover, lO to 14...Horizontal frame, 16...
...side wall. 17...Supporting surface, 18...Lower side of horizontal frame, 13 or 2! ...Screw bolt.

Claims (10)

[Claims] (1) A cylinder of a multi-cylinder in-line internal combustion engine with in particular four valves in each cylinder, including a bearing housing supported in the cylinder head housing and provided in the cross section of the cylinder head at approximately the same distance from each other. 2 on the head
In the device for installing two camshafts, the bearing housing (4a to 5e) is separated from the cylinder head housing (3) together with the vertical frame (7, 8) and the horizontal frame (10 to 14) into a camshaft bearing frame (6).
A device for attaching two camshafts to a cylinder head of a multi-cylinder in-line internal combustion engine, characterized in that the camshaft bearing frame (6) can be screwed onto a cylinder head housing (3). (2) The bearing housing (4a to 5e) is connected to the vertical frame (7,
8) The device according to claim 1, characterized in that it is provided inside each of the two. (3) The horizontal frame (10 to 14) is comprised of bearing housings located on the side surface of the cylinder head and each coupled to a pair of bearing housings, as claimed in claim 1 or 2. Equipment described in Section. (4) the individual bearing housing pairs are divided into a bearing cover (9) and a bearing bottom forming a horizontal frame (10 to 14);
The bottom of the bearing is provided with through holes (22 to 24) into which threaded bolts (19 to 21) are inserted.
19 to 21), the bearing cover (9) can be screwed onto the bearing bottom, and at the same time the camshaft bearing frame (6) can be screwed onto the cylinder head housing (3), An apparatus according to any one of claims 1 to 3. (5) A camshaft bearing frame (6) extends the entire length of the cylinder head housing (3) and extends over the outer horizontal frame (10
, 14) each extend inside immediately adjacent to the end-side housing wall, and the intervening crossbars (11 to 13) each extend between the cylinders. 4. The device according to any one of items 4 to 4. (6) The camshaft bearing frame (e) is made of cast metal, and the lower side (18) of the horizontal frame (10 to 14) consisting of the pair of bearing housings is machined flat, and this is the cylinder head housing extending between the cylinders. Claim 1 characterized in that it is fixed by threaded bolts (13 to 21) to a similarly flattened support surface (17) on the lateral wall (16) of (3). The apparatus according to any one of Items 1 to 5. (7) According to any one of claims 1 to 6, characterized in that the support surface (17) of the side wall (16) and the mounting surface (37) of the cylinder head cover are in one plane. The device described. (8) one of the through holes (22 to 24) is provided with a threaded portion (42) in order to retain the camshaft pre-installed in the camshaft bearing frame (8) at the bottom of each individual bearing; One of the threaded bolts (10 to 21) provided for fixing the camshaft bearing frame (6) to the cylinder head housing is screwed into this threaded portion, and the screw protrudes upward from the bearing cover (9). A support sleeve (43) provided with a slit around the bolt shaft of the bolt.
is pushed in, and this support sleeve (43) is inserted into the bearing cover (9).
) is pressed against and held against the bearing bottom (horizontal frames 10 to 14). (9) The through hole (
9. Device according to claim 1, 4 or 8, characterized in that 23) is provided with a threaded part (42). (10) Vertical frame (7, 8) or horizontal frame (10 to 14)
Claims 1 to 9 are characterized in that an oil groove (vertical hole 38) is provided in the oil groove (38), and an oil passage (39) extending from the oil groove (38) to the bearing housing pair is branched. The device described in any of the above.